27937691 has 2 divisors, whose sum is σ = 27937692. Its totient is φ = 27937690.

The previous prime is 27937669. The next prime is 27937697. The reversal of 27937691 is 19673972.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27937691 is a prime.

It is a super-2 number, since 2×27937691² = 1561029156822962, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (27937697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13968845 + 13968846.

It is an arithmetic number, because the mean of its divisors is an integer number (13968846).

Almost surely, 2^27937691 is an apocalyptic number.

27937691 is a deficient number, since it is larger than the sum of its proper divisors (1).

27937691 is an equidigital number, since it uses as much as digits as its factorization.

27937691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 142884, while the sum is 44.

The square root of 27937691 is about 5285.6116959156. The cubic root of 27937691 is about 303.4334836820.

The spelling of 27937691 in words is "twenty-seven million, nine hundred thirty-seven thousand, six hundred ninety-one".